<template>
  <div class="app-container">
    <h2 style="text-align: center;">发布新课程</h2>
    <el-steps :active="2" process-status="wait" align-center style="margin-bottom: 40px;">
      <el-step title="填写课程基本信息"/>
      <el-step title="创建课程大纲"/>
      <el-step title="最终发布"/>
    </el-steps>
    <el-button type="text" @click="openChapter">添加章节</el-button>
    <!-- 添加和修改章节表单 -->
    <el-dialog :visible.sync="dialogChapterFormVisible" title="添加章节">
      <el-form :model="chapter" label-width="120px">
        <el-form-item label="章节标题">
          <el-input v-model="chapter.title"/>
        </el-form-item>
        <el-form-item label="章节排序">
          <el-input-number v-model="chapter.sort" :min="0" controls-position="right"/>
        </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="dialogChapterFormVisible = false">取 消</el-button>
        <el-button type="primary" @click="saveOrUpdate">确 定</el-button>
      </div>
    </el-dialog>
    <!-- 章节 -->
    <ul class="chanpterList">
      <li
        v-for="chapter in chapterVideoList"
        :key="chapter.id">
        <p>
          {{ chapter.title }}
          <span class="acts">
                <el-button type="text" @click="openVideo(chapter.id)">添加课时</el-button>
                <el-button style="" type="text" @click="openEditChapter(chapter.id)">编辑</el-button>
                <el-button type="text" @click=removeChapter(chapter.id)>删除</el-button>
            </span>
        </p>
        <!-- 视频 -->
        <ul class="chanpterList videoList">
          <li
            v-for="video in chapter.children"
            :key="video.id">
            <p>{{ video.title }}
              <span class="acts">
                        <el-button type="text" @click="openEditVideo(video.id)">编辑</el-button>
                        <el-button type="text" @click="removeVideo(video.id)">删除</el-button>
                    </span>
            </p>
          </li>
        </ul>
      </li>
    </ul>
    <el-form label-width="120px">
      <el-form-item>
        <el-button @click="previous">返回修改</el-button>
        <el-button :disabled="saveBtnDisabled" type="primary" @click="next">下一步</el-button>
      </el-form-item>
    </el-form>

    <!-- 添加和修改课时表单 -->
    <el-dialog :visible.sync="dialogVideoFormVisible" title="添加课时">
      <el-form :model="video" label-width="120px">
        <el-form-item label="课时标题">
          <el-input v-model="video.title"/>
        </el-form-item>
        <el-form-item label="课时排序">
          <el-input-number v-model="video.sort" :min="0" controls-position="right"/>
        </el-form-item>
        <el-form-item label="是否免费">
          <el-radio-group v-model="video.free">
            <el-radio :label="true">免费</el-radio>
            <el-radio :label="false">默认</el-radio>
          </el-radio-group>
        </el-form-item>
        <el-form-item label="上传视频">
          <el-upload
            :on-remove="handleVodRemove"
            :before-remove="beforeVodRemove"
            :on-success="handleVodUploadSuccess"
            :file-list="fileList"
            :action="BASE_API+'/vod/uploadVideo'"
            :limit="1"
            class="upload-demo">
            <el-button size="small" type="primary">上传视频</el-button>
            <el-tooltip placement="right-end">
              <div slot="content">最大支持1G，<br>
                支持3GP、ASF、AVI、DAT、DV、FLV、F4V、<br>
                GIF、M2T、M4V、MJ2、MJPEG、MKV、MOV、MP4、<br>
                MPE、MPG、MPEG、MTS、OGG、QT、RM、RMVB、<br>
                SWF、TS、VOB、WMV、WEBM 等视频格式上传</div>
              <i class="el-icon-question"/>
            </el-tooltip>
          </el-upload>
        </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="dialogVideoFormVisible = false">取 消</el-button>
        <el-button :disabled="saveVideoBtnDisabled=false" type="primary" @click="saveOrUpdateVideo">确 定</el-button>
      </div>
    </el-dialog>
  </div>
</template>

<script>
  import chapter from '../../../api/edu/chapter'
  import video from '../../../api/edu/video'
  export default {
    name: 'chapter',
    data(){
      return{
        saveBtnDisabled:false,
        chapterVideoList:[],
        dialogChapterFormVisible:false,
        chapter:{},
        video:{},
        dialogVideoFormVisible:false,
        fileList:[],
        BASE_API:process.env.BASE_API
      }
    },
    created() {
      this.getChapterVideo()
    },
    methods:{
      handleVodRemove(){
        //调用接口方法删除
        video.removeVideo(this.video.videoSourceId).then(res=>{
          this.$message({
            type: 'success',
            message: '删除成功!'
          })
          //清空fileList
          this.fileList=[]
          //把video视频id和视频名称清空
          this.video.videoSourseId=''
          this.video.videoOriginalName=''
        })
      },
      beforeVodRemove(file){
        //点x调用的方法
        return this.$confirm(`确定移除${file.name}?`)
      },
      //上传成功回调
      handleVodUploadSuccess(response, file, fileList){
        //上传视频id
        this.video.videoSourceId=response.data
        //上传视频名称
        this.video.videoOriginalName=file.name
      },
      openEditVideo(id){
        this.dialogVideoFormVisible=true
        video.getVideo(id).then(res=>{
          this.video=res.data
        })
      },
      removeVideo(id){
        this.$confirm('此操作将永久删除该记录, 是否继续?', '提示', {
          confirmButtonText: '确定',
          type: 'warning'
        }).then(() => {
          return video.deleteVideo(id)
        }).then(() => {
          this.getChapterVideo() //刷新页面
          this.$message({
            type: 'success',
            message: '删除成功!'
          })
        }).catch((response) => { // 失败
          if (response === 'cancel') {
            this.$message({
              type: 'info',
              message: '已取消删除'
            })
          } else {
            this.$message({
              type: 'error',
              message: '删除失败'
            })
          }
        })
      },
      openVideo(id){
        this.video={}
        this.dialogVideoFormVisible=true
        //设置章节id
        this.video.chapterId=id
        //设置课程id
        this.video.courseId=this.$route.params.id
      },
      openChapter(){
        this.chapter={}
        this.dialogChapterFormVisible=true
      },
      saveOrUpdateVideo(){
        if (this.video.id){
          //修改
          video.updateVideo(this.video).then(res=>{
            //关闭弹框
            this.dialogVideoFormVisible=false
            //提示信息
            this.$message({
              type: 'success',
              message: "修改小节成功"
            })
            //刷新页面
            this.getChapterVideo()
          })
        }else {
          video.addVideo(this.video).then(res=>{
            //关闭弹框
            this.dialogVideoFormVisible=false
            //提示信息
            this.$message({
              type: 'success',
              message: "添加小节成功"
            })
            //刷新页面
            this.getChapterVideo()
          })
        }
      },
      removeChapter(id){
        this.$confirm('此操作将永久删除该记录, 是否继续?', '提示', {
          confirmButtonText: '确定',
          type: 'warning'
        }).then(() => {
          return chapter.deleteChapter(id)
        }).then(() => {
          this.getChapterVideo() //刷新页面
          this.$message({
            type: 'success',
            message: '删除成功!'
          })
        }).catch((response) => { // 失败
          if (response === 'cancel') {
            this.$message({
              type: 'info',
              message: '已取消删除'
            })
          } else {
            this.$message({
              type: 'error',
              message: '删除失败'
            })
          }
        })
      },
      openEditChapter(id){
        //触发修改章节弹框
        this.dialogChapterFormVisible=true
        chapter.getChapterInfo(id).then(res=>{
          this.chapter=res.data
        })
      },
      saveOrUpdate(){
        if (this.chapter.id){
          //修改
          chapter.updateChapter(this.chapter).then(res=>{
            //关闭弹框
            this.dialogChapterFormVisible=false
            //提示信息
            this.$message({
              type: 'success',
              message: "修改章节成功"
            })
            //刷新页面
            this.getChapterVideo()
          })
        }else {
          this.chapter.courseId=this.$route.params.id
          //添加章节
          chapter.addChapter(this.chapter).then(res=>{
            //关闭弹框
            this.dialogChapterFormVisible=false
            //提示信息
            this.$message({
              type: 'success',
              message: "添加章节成功"
            })
            //刷新页面
            this.getChapterVideo()
          })
        }
      },
      getChapterVideo(){
        chapter.getChapterVideo(this.$route.params.id).then(res=>{
          this.chapterVideoList=res.data
        })
      },
      previous(){
        this.$router.push({ path: '/course/info/'+this.$route.params.id })
      },
      next(){
        this.$router.push({ path: '/course/publish/'+this.$route.params.id })
      }
    }
  }
</script>

<style scoped>
  .chanpterList{
    position: relative;
    list-style: none;
    margin: 0;
    padding: 0;
  }
  .chanpterList li{
    position: relative;
  }
  .chanpterList p{
    /*float: left;*/
    font-size: 20px;
    margin: 10px 0;
    padding: 10px;
    height: 70px;
    line-height: 50px;
    width: 100%;
    border: 1px solid #DDD;
  }
  .chanpterList .acts {
    float: right;
    font-size: 14px;
  }
  .videoList{
    padding-left: 50px;
  }
  .videoList p{
    /*float: left;*/
    font-size: 14px;
    margin: 10px 0;
    padding: 10px;
    height: 50px;
    line-height: 30px;
    width: 100%;
    border: 1px dotted #DDD;
  }
</style>
